Problem with calling Javadoc in MyEclipse

When you use MyEclipse to write Java code, you have a description or hint for the mouse when you put it on elements such as the corresponding method or field.

However, the following problems often occur:

Note:an exception occurred while getting the Javadoc.see log for details.

Note:this element Neither has attached source nor attached Javadoc and hence no information coul D be found.

Note:this element has no attached source and the Javadoc could not being found in the attached Javadoc

Click on the open input under Javadoc:

Class editor hint that the corresponding Rt.jar file could not be found.

Can attach the source by clicking Attach source below

Then, click "Attach source" to load the appropriate file:

Select External file:

If you install the JDK, the path to the attached file is:

C:\Program Files\java\jdk1.6.0_12\src.zip

Ok! Everything's fine:

Good luck......